Screen.



J. R. EOGG.

SCREEN.

APPLIUATION FILED 00122. 1909.

Patented Aug. 16, `19.10.

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THE Nunms PETERS co., wAsmNamNY a. c.

' UNITED ,STATES PATENT OFFICE.

JAMES ROBINSON FOGG, OF KENNE'IT SQUARE, PENNSYLVANIA, ASSIGNOR TO THE.AMERICAN ROAD MACHINE COMPANY, OF KENNEI'T SQUARE, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

To all whom it may concern.'

Be it known that I, JAMES It. Foes, a citizen of the United States,residing at Kennett Square, county of Chester and State of Pennsylvania,have invented a new and useful Improvement in Screens, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, which form a part of this specification.

My invention has for its object to provide a screen adapted forscreening, on a large scale, materials, such as sand, coal, ore, rock,etc., that are in a moist or wet condition, such materials tending toclog up the interstices ofthe screen and make the screening` operationboth slow and imperfect.

In the drawings: Figure 1 is a plan view of the machine partly brokenaway; Fig. 2 is a side elevation of the same partly broken away; Fig. 3is a crossesection on the line 3-3 of Fig. 1; Fig. 4l is a partial planview of another embodiment of the invention; Fig. 5 is a cross-sectionon the line 5-5 of Fig. 4; E ig. 6 is a side elevation of the part ofthe machine shown in Fig. 4.

The preferred embodiment of my invention shown in Figs. 1, 2 and 3 willfirst be described. a, 0:, are two longitudinal beams on which thescreen frame and appurtenances are supported. b, o, are cross-beamssupported between the beams a, a. A rectangular screen frame c composedof sidebeams joined by cross beams is supported on the cross-beams o.The side beams of the screen frame 0 are, intermediate of their length,bolted to angle irons d, which in turn are bolted to the supportingbeams a. e, e, e, are upright plates which are secured to the screenframe and extend along the sides and one end of the screen frame. f isthe screen, which is secured to the upper face of the screen frame 0.The plates e extend a substantial distance above the level of the screenand screen frame and form, with the screen, a receptacle for thereception of the material to be screened. g, g, are strips, triangularin cross-section, extending along the side edges of they screen f andthe lower edges of the side plates e, e, and are nailed to the sidebeams of the screen-frame c. z. is a driving shaft extending across themachine and rotatable in bearings secured to the supporting beams a. c',z', z', z', are rock Specification of Letters Patent.

Application filed ctober 2, 1909.

SCREEN.

Patented Aug. 16, 1910.

Serial No. 520,737.

shafts extending across the machine and turnable in bearings secured tothe support ing beams a. Secured to the driving shaft z, is an eccentricj, which is surrounded by a strap 7c having an arm Z provided with a pinm adjustably fastened in a slot a in the lower end of an arm 0 securedbetween its ends to one of the rock-shafts z'. Secured to the otherrock-shafts are arms p. The upper ends of the arms p and the upper endof arm 0 are connected together by means of a rod Q. Secured to each ofthe rock shafts are whips or beaters, each consisting of a metal arm 9and a wooden stick s, the latter being of reduced thickness between itsends so as to render the same somewhat flexible. The rock-shaft z' ateach end of the screen is provided with a single series of beatersextending toward the other end of the screen. The intermediaterock-shafts are each provided with two series of beaters extending inopposite directions. The beaters are preferably of a length slightlyless than the distance between adjacent rock-shafts and the beaters ofeach series are arranged alternately with the oppositely-extendingbeaters .on the adjacent rock-shaft.

i The machine, constructed as above described, operates as follows: Acontinuous rotary movement is imparted to the driving shaft 7i, whichthrough the medium of the eccentric j, strap 7c, arm Z and arm 0, andthe rod g and arms p, rocks all the shafts z', causing the beaters r, s,to strike repeated blows upon the lower surface of the screen. The abovedescribed operation loosens and disintegrates any materials that settlein the meshes of the screen and thus tends to keep the screen open andin condition to perform its screening function as thoroughly as if thematerial were relatively dry.

Another embodiment of the invention is shown in Figs. 4L, 5 and 6,wherein 10 represents the longitudinal supporting beams, 11 the crossbeams, 12 the screen frame, 13 the screen, lll the plates forming thewalls of the receptacle, and 15 the driving shaft. 16, 16, are two rockshafts extending longitudinally of the machine on each side thereof andturning in bearings secured to the cross beams 11. On each side of themachine the driving shaft carries a bevel gear wheel 17 which drives asimilar gear 18 on a countershaft 19 turning in a bearing on one of thecross beams 11. On each shaft 19 is a crank disk 20, the crank-pin ofwhich is slidable in the slot 21 of an arm 22 secured to thecorresponding rock-shaft 16. Secured to each rock-shaft 16 is a seriesof Whips or beaters 23 similar in construction to the beaters r, s,hereinbefore described. The beaters extend transversely of the screen,and those secured to one rock-shaft are arranged alternately withrelation to the other series of beaters.

In each machine, the construction and arrangement is such that thebeaters, in moving upwardly, have their motion accelerated until at orabout the time they strike the screen, thereby causing the beaters tostrike the screen with a considerable degree of force. This accelerationis eected, in the specilic constructions herein disclosed, by reason oftheir actuation by crank mechanism properly adjusted and connected asshown.v In the first embodiment the crank mechanism comprises aneccentric and in the second embodiment a disk and crank-pin, each ofsaid mechanisms being adapted to impart to its actuated devices themovement of alternate acceleration and retardation characteristic of acrank motion. At or about the time the beaters strike the screen, theirmovement commences to be retarded, so that the beaters do not tend tomove far above the level of the screen, such tendency as there is tofurther movement of the beaters being taken care of by their capacity tobend under stress. The advantage of the accelerated motion of thebeaters is that, with a limited range of movement, they are caused tostrike the screen with the desired maximum force. The limited range ofmovement is highly desirable in that it permits a number of screens tobe superposed one upon the other and yet maintain them relatively closetogether. It is also preferred, as shown in both embodiments of theinvention, that different series of beaters should strike the screen atdierent times, this being the necessary result, in the preferredembodiment, of arranging two series of beaters on opposite sides of thesame rock-shaft and rocking all the shafts in unison in the samedirection; while the same result is attained,

in the other embodiment, by arranging the crank-pins of the twocrank-disks diametrically opposite to each other.

It Will be understood that in operation screens embodying my inventionwill be arranged, as is usual,l in a more or less inclined position.

The construction of both screens is such 4that the beaters, in theirmovement, describe all the beaters strike flat, or nearly so, againstthe screen, thereby subjecting practically the entire surface of thescreen to the beating or whipping operation. This operation of thebeaters is effected, when the rockshafts are substantially below thelevel of the screen, by -securing the flexible arms to the rigid arms atan angle to the latters direction of extension. By adjusting the arm Zin the slot n of the arm 0 (see Fig. 2) the length of the stroke of thebeaters may be varied, thus varying the force with which they strike thescreen.

Having now fully described my invention, what I claim and desire toprotect by Letters Patent is 1. The combination with a screen, of twoseries of beaters, in proximity to the screen, extending in oppositedirections toward each other, the beaters of oneseries overlapping thebeaters of the other series, and means to actuate both series ofbeaters.

2. The combination with a screen, of a plurality of shafts arranged inproximity to the screen, a series of beaters secured to each shaftextending toward and overlapping the beaters secured to, an adjacentshaft, and means to rock said shafts.

3. The combination with a screen, of two series of beaters, in proximityto the screen, extending in opposite directions and overlapping eachother, the beaters of one series being arranged alternately relativelyto the beaters of the other series, and means to actuate both series ofbeaters.

4. The combination with a screen, of a plurality of shafts arranged inproximity to the screen, a series of beaters secured to each shaftextending toward an adjacent shaft, the beaters of one shaft beingarranged alternately with the beaters on thc adjacent shaft extendingtoward the first shaft, and means to rock said shafts.

5. The combination with a screen, of two series of beaters, in proximityto the screen, extending in opposite directions and overlapping eachother, the beaters of one series being arranged alternately relativelyto the beaters of the other series, and means to reciprocate the twoseries of beaters in opposite' directions, thereby causing the twoseries of beaters to strike the screen alternately.

6. The combination with a screen, of iiexible beaters arranged inproximity thereto, and positively actuated means to move said beaterstoward said screen and impart thereto in said movement an acceleratedmotion.

7. The combination with a screen, of a shaft arranged in proximitythereto, rigid arms secured to said shaft, flexible arms secured to saidrigid arms, and means to rock said shaft.

8. The combination with a screen, of a shaft arranged in proximitythereto, rigid arms secured to said shaft, arms of yielding materialsecured to said rigid arms, said yielding arms being of reduced sectionbetween their ends to increase their flexibility, and means to roclrsaid shaft.

9. The combination with a screen, of a shaft arranged in proximitythereto, rigid arms secured to said shaft, iiexible arms secured to therigid arms and extending at an angle to the latters direction ofextension, and means to rock said shaft.

10. The combination with a screen and its supporting frame work, of ashaft arranged in proximity to the screen and turning in stationarybearings on the supporting frame-work, beaters secured to the shaft, arotatable driving shaft, and mechanism, positively actuated by thedriving shaft and positively actuating the beater' shaft, adapted toconvert the rotary movement of the driving shaft into an oscillatingmovement of the beater shaft, whereby the beaters are positively movedtoward and from the screen.

11. The combination with a screen, of a number of shafts extendingcross-wise of, and in proximity to, the screen, one or more of saidshafts having two series of beaters extending respectively in oppositedirections lengthwise of the screen, and means to rock the shafts.

12. The combination with a screen, of a number of shafts extendingcross-wise of, and in proximity to, the screen, a plurality of saidshafts having two series of beaters extending respectively in oppositedirections i lengthwise of the screen, the beaters of each of saidseries being arranged alternately with respect to the oppositelyextending beaters of the next adjacent shaft, and means to rock saidshafts.

13. The combination with a screen, of a number of shafts extendingcross-wise of, and in proximity to, the screen, each shaft except theend shafts having two series of beaters extending respectively inopposite directions lengthwise of the screen, and the end shafts havingeach a series of beaters extending lengthwise of the screen toward theother shafts, and means to roclr the shafts.

14. The combination with a screen, of a plurality of rock-shaftsextending cross-wise of, and in proximity to, the screen, beaterssecured to said shafts extending lengthwise of the screen, a drivingshaft, an eccentric thereon, means to oscillate one of said rockshaftsfrom said eccentric, arms on each rock-shaft, a rod connecting saidarms, and beaters secured to the several rock-shafts.

15. The combination with a screen, of a shaft arranged in proximity tothe screen, beaters secured to the shaft, a rotatable driving shaft,mechanism between said driving shaft and beater shaft adapted to convertthe rotary movement of the former into an oscillatory movement of thelatter, said mechanism including an adjustable device adapted to varythe extent of said oscillation.

In testimony of which invention, I have hereunto set my hand, atPhiladelphia, on this 25th day of September, 1909.

JAMES ROBINSON FOGG.

Witnesses:

EDWIN S. PHILIPS, W. D. MUssoN.

